Definition of "tetrahedra" [tetrahedra]

• Plural form of tetrahedron. (noun)

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• "Lowell Gilbert @ 13, kid bitzer @ 15 -- Remember that the tetrahedral shape is that of the four bonds of the carbon atom; the implied tetrahedra are connected tip-to-tip, not solidly packed."
• "Five points form the vertices of two regular tetrahedra, joined on a common face situated in the horizontal plane."
• "“Clay” as a mineral refers to a “cousin” of micas; that is, a silicate mineral containing structural sheets of silica tetrahedra tetrahedral arrangements of one Si and 4 Oxygen atoms, with the Oxygen atoms at the 4 corners."